OPTIMIZATION OF FOOD RATIONS USED FOR THE PRE-DEVELOPMENT OF THE SPECIES ACIPENSER BAERII (J.F. BRANDT, 1869) IN RECIRCULATING AQUACULTURE SYSTEM

Sturgeon farming is practiced in rearing systems with different types of fresh water, such as surface water, depth water (including geothermal water) and industrial water. If at the beginning of twentieth century sturgeon farming was successfully applied in ponds, nowadays, with the need for quantitative and qualitative productions imposed by the principles of economic viability in the context of ensuring the norms of the European Union, high intensity recirculating rearing systems have been developed. Nutrition plays a central role in sustainable aquaculture and, as a result, research on food resources as well as production costs continues to dominate aquaculture worldwide. According to literature, sturgeon fingerlings with a length of 2,5 – 12,5 cm require a daily ration of 5 - 7% of body weight per day. The optimization of feeding rations for Acipenser baerii related to the pre-development stage in a recirculating aquaculture system was carried out accordingly by following the biotechnological indicators (especially the growth increase) which indicate a favourable growth rate of the biomass.